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programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What causes “Error C stack overflow” in haskell usually up vote 4 down vote favorite What are the usual causes stack overflow error windows 7 of "Error C stack overflow" in the Hugs Haskell implementation. haskell stack-overflow lazy-evaluation share|improve this question edited Apr 18 '11 at 22:59 Don Stewart 116k26301429 asked Mar 17 '10 at 14:00 Nubkadiya 812102541 4 Which implementation? HUGS? NHC? GHC? –JUST MY correct OPINION Mar 17 '10 at 14:02 1 All the answers seem to be talking about overflowing the Haskell runtime's stack. The C stack is different, at least in GHC. stack overflow javascript error Is this a confusing error message, or is the problem actually FFI-related. (I have done a lot of FFI work and have never seen this. But I use GHC.) –jrockway Mar 18 '10 at 1:17 add a comment| 4 Answers 4 active oldest votes up vote 10 down vote accepted This can come up if you are used to functional languages in which it is common to do tail-recursion factorization. Say you have a function: sum = go 0 where go accum [] = accum go accum (x:xs) = go (accum+x) xs Which, incidentally, is the same as sum = foldl (+) 0 If we evaluate the function we can see the problem: sum [1,2,3,4] go 0 [1,2,3,4] go (0+1) [2,3,4] go ((0+1)+2) [3,4] go (((0+1)+2)+3) [4] go ((((0+1)+2)+3)+4) [] (((0+1)+2)+3)+4 Now to evaluate that expression Haskell uses a stack: EXPR | STACK (((0+1)+2)+3)+4 | ((0+1)+2)+3 | +4 (0+1)+2 | +3 +4 (0+1) | +2 +3 +4 1 | +2 +3 +4 3 | +3 +4 6 | +4 10 | And this is where an overflow can occur. If you evaluated sum [1..10^6], that stack would be a million entries deep. But note the pathology here. You recurse over a list only to build up a huge fscking expression ("thunk"), and then use a stack to evaluat
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Join them; it only takes a minute: Sign up How does a “stack overflow” occur and how do you prevent it? up vote 26 down vote favorite 10 How does a stack overflow occur and what are the http://stackoverflow.com/questions/2462780/what-causes-error-c-stack-overflow-in-haskell-usually best ways to make sure it doesn't happen, or ways to prevent one, particularly on web servers, but other examples would be interesting as well? memory stack-overflow share|improve this question edited Jul 29 at 17:46 Kapol 4,2592727 asked Aug 25 '08 at 14:49 JasonMichael 88231621 add a comment| 9 Answers 9 active oldest votes up vote 42 down vote accepted Stack A stack, in this context, is the last in, first out buffer you place data while your http://stackoverflow.com/questions/26158/how-does-a-stack-overflow-occur-and-how-do-you-prevent-it program runs. Last in, first out (LIFO) means that the last thing you put in is always the first thing you get back out - if you push 2 items on the stack, 'A' and then 'B', then the first thing you pop off the stack will be 'B', and the next thing is 'A'. When you call a function in your code, the next instruction after the function call is stored on the stack, and any storage space that might be overwritten by the function call. The function you call might use up more stack for its own local variables. When it's done, it frees up the local variable stack space it used, then returns to the previous function. Stack overflow A stack overflow is when you've used up more memory for the stack than your program was supposed to use. In embedded systems you might only have 256 bytes for the stack, and if each function takes up 32 bytes then you can only have function calls 8 deep - function 1 calls function 2 who calls function 3 who calls function 4 .... who calls function 8 who calls function 9, but function 9 overwrites memory outside the stack. This might overwrite memory, code, etc. Many programmers make this mistake by calling function A that then calls function B, that then calls function C, that then calls function
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